1. Oculoplastic Division, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia
2. Department of Ophthalmology, Complejo Asistencial de Palencia, Palencia, Spain
3. Department of Ophthalmology, King Saud University College of Medicine, Riyadh, Saudi Arabia
4. Department of Ophthalmology Faculdade de Medicina de Botucatu, UNESP, São Paulo, Brasil